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Thread: tig questions

  1. #16
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    Yes!
    Scratch and lift .

    Hopefully just once per arc.

    Grahame

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  3. #17
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    I agree with grahame re not needing a foot pedal to TIG. Im a TIG newbie and I learnt to TIG using a footpedal. Whilst looking at welders to buy for home I noticed many charge a lot more for the foot pedal, so in class I had a go without it. I reckon as a beginner its easier to weld WITHOUT a foot pedal at first. reason being is that its one less variable for you to worry about. I found that when I wasnt thinking about what I was doing with my foot I could concentrate more on torch angle and the wire fill and it produced a better result.

    In fact im not even sure when a foot pedal would be of benefit, grahame perhaps you could help me.

  4. #18
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    hi guys haven't had much luck my welding shop was out of argon so i decided to try with mig gas but the tungsten melted away like a stick welding electrode is this because of the 2% oxygen in the gas mix or is my welder kaput


    andre

  5. #19
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    Its either that or you or you inadvertently got the polarity rrse about - as in electrode positive. That tends to make tungsten's burn off like a candle.

    Tungsten's are only run like that for coating hard facing with very large tungsten s
    (ie 10 mm) ,high amps and a water cooled torch.

    Grahame

  6. #20
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    most inverter tigs should be DC tig lift shouldnt they?

    you basically just touch the electrode to the work piece then lift the tourch and the machine will start the arc!

  7. #21
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    Quote Originally Posted by 19brendan81 View Post
    In fact im not even sure when a foot pedal would be of benefit, grahame perhaps you could help me.
    Its usefull when welding alloy, you can first put in more amps to get some heat into the job, then once there is sufficent heat you can start to lower the amps so the work piece wont melt.

  8. #22
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    Useful but not essential.

    A foot pedal for my Fronius runs around a$1000 at the moment.I can manage with out it for the forseeable future.
    Use a pre heat with a bit of LP or Mapp gas -no problem.

    Grahame

  9. #23
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    I know little about welding and almost nothing about hydraulic and even less about TIG but if its mild low carbon steel why use TIG over mig?

    Yes duty cycle is poor but 3mm is not too thick, slow but not too difficult.

    I'm interested why TIG would have a better duty cycle than MIG.

    Would gasless wire use the same amps [not a fan].

    Slow mig versus first time tig.

    I will concede defeat with Graham on welding but just interested to know.

    Cheers

    Pulpo

  10. #24
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    Quote Originally Posted by Pulpo View Post
    but if its mild low carbon steel why use TIG over mig?
    You have complete control over the welding process, with MIG you have a limited control over wire feed and voltage but suffice to say once an arc is started you will be laying down metal regardless. With TIG you can do whatever you want, when welding thin materials this is important. You want to have control over the pool and metal deposition. Not to mention that there is zero slag and the weld will be of a higher quality. Weld bead appearance may also be a critical factor where a MIG weld would be unsuitable.

  11. #25
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    Quote Originally Posted by Pulpo View Post
    I know little about welding and almost nothing about hydraulic and even less about TIG but if its mild low carbon steel why use TIG over mig?
    The choice of process selection has more to do with the way the process behaves rather than its duty cyle.

    Welder has a requirement that there is absolutely no chance of leakage of hydraulic oil fro his tank.

    Using a mig process there is a good chance of lack of fusion and penetration in the very beginning of the bead.

    This is because the parent metal at the start is cold and has not been brought up to fusion temperature by the arc.
    It can be a problem on thin gauge stuff unless one is very skilled.This means the operator must understand and predict where the lack of fusion will occur and utilise a procedure to overcome this problem.For example a start or a stop on a corner will almost certainly generate a lack of fusion resulting in a leak.

    Tig by virtue of a slow travel speed is much more controllable.It can be manipulated to fuse when and where the operator requires. Also it is not feeding in wire that over cools the molten pool (In this instance, we are talking about at the beginning of the bead)

    Grahame

  12. #26
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    The more i read about welding the less I seem to understand.

    Yeah paraphrased from some other quote I'm sure.

    Thanks

    You learn something every day.

    Pulpo

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